Don't forget that at BAA airports, you can buy 'FastTrack' status for a fiver or so ... this (supposedly) gets you through security faster, using the FastTrack lane reserved for First/Business/CIP pax.
Of course, if too many people buy the FastTrack passes, then the 'fast track' will slow down to the pace of the other ones ... necessitating the opening up of a new 'Super FastTrack'!
Sounds a bit like Premier Economy to me!